Insulator-pin.



UNITED STATES PATENT; orrion.

JOHN W. PORTER, OF CHICAGO, ILLINOIS, ASSIGNOR '10 ELECTRIC SERVICESUPPLIES COMB ANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYL- I 'vAm A.

INSULATOR-PIN.

' Application and as. a, 1

in side elevation, of 'an insulator pin embodying my improvements,showing in cross section an arm of the type upon which the pin isusually mounted. Fig-II, is a transverse section on the line II, II, ofFig. I. Fig. III, is a partial longitudinal section on the lineindicated at III, III,

in Fig. I; "Fig. IV, is a transverse section on the line IV, IV, of Fig.I.

The insulator pin to which my invention is especially adapted is of thegeneral type setforth'in Letters Patent of the United States No.1,094,852, dated April 28th, 1914:,

and the object, of my invention is to improve a pin of that'character incertain particulars, which greatly facilitates the work of securing andadjusting the pin in position and of obtaining a proper relation betweenthe insulator and .the pin. These features Will be more particularlyadverted to hereafter; 4

In the drawings' the base member of the pin comprises an elongatedhollow tubular portion 1, with tapering strengthening ribs 2, disposedin quadrant relation and a bottom plate 3, adapted to fit upon andembrace the cross arm 4, said cross arm being also perforated with anopening registering with the internal opening of the tubular portion 1The upper extremity of the base member 1, is enlarged as indicated at 5,and contains an annular chamber 6 of larger di ameter than thecylindrical bolt 7, said chamber having at bottom a shoulder 8, inposition to engage when free to do so, with the flanged collar 9, (ofless depth than the chamber 6), which is located upon said bolt belowthe screw threaded upper portion 10, thereof. Upon the portion of thebolt7, immediately below this collar 9, I

' provide alateral projection, preferably comprising two wings, asshownat 11, and 12,

which may conveniently becast integrally Specification of LettersPatent.

914. Serial No. 2342,5425.

with l the bolt 7 and which extends outward a substantial distancebeyond the circular pe Patented Sept. 26, 1916.

'riphery of the bolt. By reference to Fig.

depth of the collar 9, but upon reference 1 to Figs. I, and II, it willbe seen that on diametrically opposite sides, the opening of the chamberis extended downward through the shoulder 8, forming lateral recesses asshown at 13, and 14, in such manner that the wings 11, and 12, arereceived and'retamed within said openingsv A thimble 15, of the ordinaryconstruction is adapted tobe screwed down upon the threaded upperportion 10, of the bolt 7, the lower extremity of said thimble beingpreferably enlarged so as to fit snugly upon the upper periphery of thechamber 6, and form a close joint therewith. The lowerextremity of thebolt 7 is also threaded, as indichted at 16, and provided with a nut 17.The insulator 18, may be secured to the thimble 15, in the usual manner.

It will be noted by the above construction that when the base member ismounted upon the cross arm and the bolt 7, is inserted in position, saidpin will drop downward until i the collar 9, being lifted a shortdistance-oil the shoulder 8,as shown in Fig. III, when' the insulator isscrewed home.

By the use of my improvements above set forth, the bolt 7, while capableof free in sertion and removal, and while being retained securelyagainst dropping, is rendered non-rotatable after it is once seated inplace, afi'ording' certain very desirable advantages. Thus, when thebolt is rotatable and the lineman attempts to screw the insular down, ifthe friction of the threads at the upper end of the bolt is greater thanthe friction of the threads at the lower end,

the bolt tends to rotate withrelation to the lower nut, and theinsulator may not be screwed home properly. quires the lineman to gripthe lower thread Thissometimes reed endof the bolt by means of a pair oftongs or pipe wrench, in order to screw the insulator thimble intoproper position. The

dilhculty is wholly obviated by my invention, as the bolt cannot turnwithin the base member. Furthermore, by the use of my improvements, thelineman is assured that he is securing the benefit of the full length ofthe thread in the thimble, and he is relieved from using his judgment inregard to the number of turns'required since he screws the insulator onuntil itcomes home,

thus insuring the proper contact between the bottom of the thimble andthe upper extremity of the base member. If in its home position the wiregroove 20, at the top of the insulator is not in' proper relation to theposition of the line wire the thimble and insulator are turned back notexceeding a half rotation until the wlre and its groove are 1n almementand the nut 17, turned to i take up the slack.

.Tt has been'found in practice that in previous constructions, theactual tension of the bolt was frequently upon the collar it self, thestrength of the structure as a whole therefore depending upon thebending moment of that portion of the bolt which is i above the collar.My improvement prevents tthis from'occurring. Another diffi culty whichis avoided by the use of my improvement is the possibility of the boltooming unscrewed from the insulator thimble, through carelessness orotherwise, withthe insulator, since the rotation thereof will simplyturn the bolt.

Having thus described my invention, I desire to state that I do not, onthe one hand, claim any of the features which are set forth in the saidPatent No. 1,091,852, in themselves, nor, on the other hand, do Irestrict myself to the employnn-uit of those.

exact details in combination with the new elements which distinguish myinvention.

I claim:

The combinationof a base'member having a tubular portion adapted toreceive a bolt and provided, at its upper extremity, with a chamberhaving an annular shoulder at its bottom, embracing the opening of thetube, and also having a lateral recess extending downward into'saidshoulder and communicating with said tubular opening; a bolt havinga collar adapted to be received within the upper portion of said chamberbut engaging with said shoulder, said collar beingo'f less verticaldepth than the depth of the chamber; a lateral projection upon said boltarranged below said collar, and extending vertically to a. distancegreater than.

the vertlc'al play of said collar within said chamber, said projectionbeing adapted to engage operatlvely in said recess and prevent rotationof thebolt at any vertical adjustment of the collar within the chamber;said bolt being threaded at itsv upper and lowerv extremities; aninsulator thimble; and a nut; adapted to engage respectively the1iiplper and lower threaded portions of the In testimony whereof, .Ihave hereunto signed my name, at Chicago, Illinois, this 28th day of May1914:.

JOHN W. PORTER.

Witnesses:

MAX A. Buns, O. MUELLER.

